Setuptools_git package

This is a plugin for setuptools that enables git integration. Once
installed, Setuptools can be told to include in a package distribution
all the files tracked by git. This is an alternative to explicit
inclusion specifications with `MANIFEST.in`.
Authors:
--------
Humberto Diogenes <humberto@digi.com.br>
Yannick Gingras <ygingras@ygingras.net>